321542561651 has 2 divisors, whose sum is σ = 321542561652. Its totient is φ = 321542561650.

The previous prime is 321542561597. The next prime is 321542561657. The reversal of 321542561651 is 156165245123.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 321542561651 - 2³⁴ = 304362692467 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 321542561599 and 321542561608.

It is not a weakly prime, because it can be changed into another prime (321542561657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160771280825 + 160771280826.

It is an arithmetic number, because the mean of its divisors is an integer number (160771280826).

Almost surely, 2^321542561651 is an apocalyptic number.

321542561651 is a deficient number, since it is larger than the sum of its proper divisors (1).

321542561651 is an equidigital number, since it uses as much as digits as its factorization.

321542561651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216000, while the sum is 41.

The spelling of 321542561651 in words is "three hundred twenty-one billion, five hundred forty-two million, five hundred sixty-one thousand, six hundred fifty-one".